Piston for syringe



FIG. 1 is a perspective view of a piston for syringe showing my new design;

FIG. 2 is a front elevational view thereof, the rear elevational, right side elevational, and left side elevational views being identical thereto;

FIG. 3 is a top plan view thereof, the bottom plan view being identical thereto;

FIG. 4 is a sectional view thereof taken along line 4—4 of FIG. 3; and,

FIG. 5 is a perspective view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a piston for syringe, as shown and described. 